20724370 has 8 divisors (see below), whose sum is σ = 37303884. Its totient is φ = 8289744.

The previous prime is 20724367. The next prime is 20724371. The reversal of 20724370 is 7342702.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 12769 = 4551^2 + 113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20724371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036209 + ... + 1036228.

Almost surely, 2^20724370 is an apocalyptic number.

20724370 is a deficient number, since it is larger than the sum of its proper divisors (16579514).

20724370 is a wasteful number, since it uses less digits than its factorization.

20724370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072444.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20724370 is about 4552.4026623312. The cubic root of 20724370 is about 274.6800466220.

It can be divided in two parts, 2072 and 4370, that multiplied together give a triangular number (9054640 = T₄₂₅₅).

The spelling of 20724370 in words is "twenty million, seven hundred twenty-four thousand, three hundred seventy".